# Sodium is more reactive than lithium. Why?

Feb 17, 2017

The lithium atom is smaller...........

#### Explanation:

The lithium atom is smaller than the sodium atom, and on this basis we would expect lithium to be LESS reducing.

$M \rightarrow {M}^{+} + {e}^{-}$

How can we assess this? Well, in water, sodium metal would give a few spits and sparks. The reactivity of lithium towards water would be less dramatic:

$L i \left(s\right) + {H}_{2} O \left(l\right) \rightarrow L {i}^{+} + H {O}^{-} + \frac{1}{2} {H}_{2} \left(g\right) \uparrow$